body{
  box-shadow: 0 0 10px rgba(0, 0, 0, 1);
}
header{
  width: 100%;
  height: 42px;
  display: grid;
  grid-template-columns: 40px auto repeat(3,40px);
  background-color: deeppink;
  place-items: center start;
  background-image: linear-gradient(90deg,#4c8bff 8%,#1fd2fe);
  color: #fff;
  /* electron自己定义的属性，点击可以拖动 */
  -webkit-app-region: drag;
}
header>.iconfont{
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  transition: all 0.2s;
  cursor: pointer;
}
header>span:nth-of-type(2){
  user-select: none;
}
header>.iconfont[title]{
/* electron自己定义的属性，不让它拖动了 */
-webkit-app-region: no-drag;
}
header>.iconfont[title]:hover{
  background-color: #52d3fd;
}
header>.icon-guanbi:hover{
  background-color: #c5524c !important;
}